[llvm-bugs] [Bug 47748] New: [concepts] clang selects wrong destructor

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47748

            Bug ID: 47748
           Summary: [concepts] clang selects wrong destructor
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ldalessandro at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

I believe that clang should ignore the problematic destructor in this template.

```
#include <type_traits>

struct Foo {
    ~Foo() {}
};

template <typename T>
struct Bar {
    ~Bar() requires( std::is_trivially_destructible_v<T>) = default;
    ~Bar() requires(!std::is_trivially_destructible_v<T>) {}
};

Bar<Foo> bar; // <-- picks `= default` and fails
```

Working example at https://godbolt.org/z/q5Phd1. Clang _does_ do this properly
on the default constructor side of things.

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